实现一个沿着路径移动的动画并且旋转

1.通过CAKeyframeAnimation（关键帧动画）来实现沿着沿着路径移动的动画
2.通过CABaseAnimation实现旋转
3.在CAAnimationGroup中添加这两个动画

如何使用CAKeyframeAnimation来实现沿着路径的移动

  使用CGMutablePathRef来绘制路径利用关键帧动画实现移动也可以使用UIBezierPath来绘制贝塞尔曲线路径（code）

   CGPoint startPoint = self.leafImg.center;
   CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, nil, startPoint.x, startPoint.y);
    CGPathAddQuadCurveToPoint(path, nil, 50, self.view.frame.size.height-100, startPoint.x + 360, startPoint.y + 550);///添加一个控制点和结束点
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    animation.path = path;

使用CABaseAnimation实现旋转操作（code）

CABasicAnimation *aniBase = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    aniBase.fromValue = @0;
    aniBase.toValue = @M_PI;

添加到CAAnimationGroup中，然后把动画组加到layer中

CAAnimationGroup *group = [CAAnimationGroup animation];
    group.duration = 4.f;
    group.animations = @[aniBase,animation];
    [self.leafImg.layer addAnimation:group forKey:nil];

二.使用CAKeyframeAnimation实现

[UIView animateKeyframesWithDuration:4 delay:0 options:UIViewKeyframeAnimationOptionCalculationModeCubic animations:^{
        CGPoint center = self.leafImg.center;
        [UIView addKeyframeWithRelativeStartTime:0 relativeDuration:0.1 animations:^{
            self.leafImg.center = (CGPoint){(center.x + 15), (center.y + 80)};
        }];
        ///相对于4s的时间 0.1*4=0.4s的时候开始
        [UIView addKeyframeWithRelativeStartTime:0.1 relativeDuration:0.15 animations:^{
            self.leafImg.center = (CGPoint){center.x + 45, center.y + 185};
        }];
        [UIView addKeyframeWithRelativeStartTime:0.25 relativeDuration:0.3 animations:^{
            self.leafImg.center = (CGPoint){center.x + 90, center.y + 295};
        }];
        [UIView addKeyframeWithRelativeStartTime:0.55 relativeDuration:.3 animations:^{
            self.leafImg.center = (CGPoint){center.x + 180, center.y + 375};
        }];
        [UIView addKeyframeWithRelativeStartTime:0.85 relativeDuration:.15 animations:^{
            self.leafImg.center = (CGPoint){center.x + 360, center.y + 435};
        }];
        [UIView addKeyframeWithRelativeStartTime:0 relativeDuration:1 animations:^{
            self.leafImg.transform = CGAffineTransformMakeRotation(M_PI);
        }];
    } completion:^(BOOL finished) {
       /// if (self.timer) {
           /// [self.timer invalidate];
            ///self.timer = nil;
        }
    }];